Quick relining brake



Feb. 8, 1938. T, D. RADER 2,107,503

QUI CK RELINING BRAKE origina; Filed Nov. 15, 1954 INVENTOR.

M ATToRNEY Patented Feb. 8, 1938 UNITED STATES PATENT OFFICE one-half to Richard Calif.

Original application N No. 752,823. Divided and Macintosh, Los Angeles,

ovember 13, 1934, Serial this application June 1, 1936, Serial No. 82,728

3 Claims.

The present invention is a application entitled Brake Serial No. '752,823 which has become Patent 2,068,073 issued Jan. 19, 1937. The present invention relates to brakes, and While the invention is capable of being used in many different situations, in the present specication it is described as applied to the wheel of an automobile, orv a trailer. Automobile brakes, when constructed of the inside type, usually involve the use of two oppositely disposed brake shoes that are pivotally mounted on the dust-plate on pivot points located near each other, and the brake shoes are expanded or forced outwardly by means of a pivoted double cam.

The relining of brake shoes in such a construction, is a tedious and expensive operation, and necessitates the removal of the brake shoes, and attaching the new lining by applying rivets throughout the length of the shoe. Furthermore, when air brake shoes are pivotally mounted in the usual way it is not possible to reline them without removing them from the drum, and one of the reasons for this is that the pivotal connection for one end of the shoe is usually quite close to the drum flange.

One of the objects of this invention is to provide a brake construction having shoes which can very readily be relined; also to mount the brake shoes and their actuating means in such a way as to leave the ends of the brake shoes free and unobstructed, to facilitate the removal of worn brake linings without necessitating the removal of the brake shoes, and to facilitate their replacement with new linings, at the same time avoiding the necessity for applying any rivets on the face of the brake shoe.

Further objects of the invention will appear hereinafter.

The invention consists in the novel parts and combination of parts to be described hereinafter, all of which contribute to produce an eilicient quick relining brake.

In the drawing:

Figure l is a vertical section through a brake drum and illustrating my brake mechanism with the actuating rod for the brakes broken away.

Figure 2 is a vertical section taken on the line 2 2 of Fig. 1, and also illustrating parts of the wheel and axle broken away.

Figure 3 is a developed plan of one of the brake linings removed from the brake, with its middle portion broken away. This View also shows an anchoring hook applied tol the end of the brake lining.

division of my prior led NOV. 13, 1934,

(Cl. 18S- 234) Figure 4 is a cross section taken on the line 4-4 of Fig. l, to illustrate the anchorage for the opposite end of the brake lining.

Referring more particularly to the parts, I indicates an automobile brake drum which may be part of a wheel 2. In the present instance, the wheel illustrated is supposed to be a rear wheel attached to an axle 3 mounted in an axle housing 4, tol which a dust-plate 5 is rigidly secured. The dust-plate 5 is, of course, a relatively xed frame member of the car.

In applying my invention to such a brake drum, I provide two oppositely disposed brake shoes 6, and these brake shoes are preferably identical in construction. They are preferably of arcuate form such as shown, to enable them to conform to the curvature of the inner face of the brake drum I. Each shoe 6 is preferably formed with a relatively deep central web l, and has oppositely disposed flanges 8, which form a rim for the shoe to which the brake lining 9 is applied. The brake lining is secured to each shoe so that it can be readily 4detached from it. For this purpose I prefer to provide the ends of each brake shoe with end flanges Il and II, which are preferably formed by bending the flanges 8 in a general radial direction, and inwardly toward the center of the wheel.

Any suitable means may be employed for detachably securing the ends of the brake lining. In order to accomplish this, I prefer to provide one end of the lining with a pair of bolts I2 (see Fig. 4), which may be shoved into slots I3 extending outwardly in the end anges II of the brake shoes. These bolts are provided with nuts I4 respectively, for tightening them up, and under the nuts I prefer to employ spring washers I5. The other end of each brake lining is preferably provided with a pair of anchor plates I 6, which are secured on opposite sides of the end of the lining by suitable rivets I1, and these plates I have a central opening I8, which can be applied to anchoring means preferably in the form of a hook bolt I9 located at the adjacent end of the shoe, and this hook bolt is secured in a tongue Illa which constitutes an extension of the substantially radial end ange I0. The hook bolt I9 has a threaded shank 2G to pass through the tongue I0a and receive a nut 2| for tightening it up.

In order to enable the brake lining to be detachable in this manner, it is necessary to employ means for actuating the brake shoes, which will leave their ends unobstructed. For this purpose I prefer to employ an actuator 22, which is preferably in the form` of a substantially reetangular plate, the middle portion of which has a large opening 23 to@ enable Vthe axle and axle housing 4 to pass through the same. YMeans is provided forguiding this actuator to slide to and fro on a'diametrical line through the drum located midway between the two brake shoes 6. In the present instance, the brake shoes are iocated adjacent to the upper'and lower sides of the drum, so that in the present instance, the direction of travel of the actuator 22 isY horizontal. l

The Vactuator 22 is preferabiy of angular cross section, as illustrated in Fig. 2, soy that it presents an outwardlyprojecting flange 24. The flange 24 is supported on a pluralityof posts 25 in the forni of stout pins that project inwardly from the dust-plate 5, and these posts or pins pass through horizontal slots 26 in the flanges 24, soas te guide the actuator plate 22 when it moves to and fro. 1

The slots 25 are slightly larger than the pins 25, so as to permit a siight lateral play in theactuator for a Ypurpose which will appear hereinafter.

In applying the brake, tension exerted in the brake rod 2l actuates a lever 28 pivotally mounted on the outer side of the dust-plate, angl this lever, through a rock shaft 29, operates aninner lever orvarrn 30 that is connectedV by a link 3l with the forward eind of the actuator 22. By this means the actuator 22 can be pulled forwardly, and when it moves in this direction, force is applied to the brake shoes through a plurality of inclined thrust links 32, which incline in a forward direction toward their outer ends. The

ends of Vthese links are respectively, piveted on the shoes and on the actuator, and these links are also preferably constructed so that they areY adjustable. For this purpose each link preferably comprises a threaded stem 33 that is received in a threaded sleeve 34, and may carry a lock nutV 'Ihe dust-plate is previded with means for guidingethe shoes 6 so that they will slide out-: wardly when the. braking force is appliedto theirs through the thrust links. For guiding the brake shoes outwardly, I prefer to provide the dustplate with a plurality of guide posts 36, which have reduced necks 31 their inner ends, which are received by parallel slots 38 forrr'ied in the brake shoe. These slots extend substantially at right angles to the direction of travel of the actuator 22. By reason of the reduced diameter of thene'cks 31, the outer ends of the posts form guide shoulders 39 for supporting and guiding the webs 'l of the shoes. The brakeshoes are secured to the'posts 36 by suitable nuts 40, which may be applied over suitable washers 4I (see Fig. 2'). ff i After the brakes have been applied, they will be released a return spring associated in some way with the mechanism. If desired, such returnrspring may be associated with the brake rod 21, but I prefer to employ a coil springY 42 located within the drum, attached at one end to an anchor pin 43 on the :dust-plate, and attached at its other end to the adjacent end of the actuator (see Fig. li. E f

By reason of the ifact that V'the pinsi25 and the slots 26 permit lateral play in theV actuator, it will be evident that the thrust force developed in one set of links at one side of the actuator, will be imparted through the actuator plate to the opposite set of links. This balances and equalizes the pressure of the brakes against the drum, and also enables the pins 25 to be made relatively light, as their only work is to guide the actuator plate 22 until the braking force is applied. These features are covered in my prior application referred to aiove. Y

it will beevidentthat a brake mechanism constructed as.V described, will operate to apply the braking ljorce with substantial uniformity throughout the area of the brake shoe, and urthermore,by reason of the fact that the brake shoes are positively guided in a general radial direction against YYthe brake drum, there is no possibility for either of the shoes to become locked. Y

It will also be evident that when the brake linings have become worn, they can be nuickly removed and new linings replaced, thereby rey f sulting in great saving in time censumed'in relining the brakes. In relining the brake shoes it will be evident that permitting theibrakes to assume their releasedposition, the shoes will become removedgirom the inner face of the drum, whereupon it is merely necessary to release the hooks lf and pull the worn lining oi of the facef Vof the shoe, after which the bolts l2 can be re-l moved. The new brake lining is then attached at the bolts I2 and slid lateraily into place on the face of the brake shoe. Theother end vof the lining is then attached to the hook bolts I9, and the nuts 2l tightened up to secure the lining in place. My means for actuating the shoes by shoving them Vbodily outward on a radial line, greatlyV facilitates the relining of the shoes in f the manner described above, because the entire 2z face of the brake shoe is removed considerably from the brake drum. It should be understood, however, that my mounting for the brake lining can be applied to a brake shoe that is pivotally supported, if the endsgof the brake shoe are left accessible. ,Y

In order te prevent the tension developed in the brake linings from becoming concentratednat the anchorage vat the ends of the brake shoes, I prefer to provide the outer Yface of each brake shoe with transverse grooves and rile-s indicated by the dotted line t4 in Fig. 2;

It is understood that the embodiment of Vthe invention described herein is only vone of the many embodiments this invention may take, and I do not wish to be limited in the practice of the invention, nor in the claims, to the particular embodiment set forth.

What I claim is:

l. In an automobile brake having a brakedrum, a brake-shoe with means for mounting the same for outward movement against the drum, said means attached to the brake-shoe at intermediate points;Y on the length of the shoe so as to leave the ends of the shoe clear and unobstructed, said brake-shoe having flanges at its ends, a detachable brake lining unattached to the shes at intermediate points on its length, bolt passing through one oi the flanges for securing one end of the brake lining to theiiange at one end of the shoe, a hook disposed'in a substantially radial direction at the other end of the shoe and hooked into the adjacent end of the brake lining, said hook having a threaded shank passing through the adjacent flange of the brakes'hoe with a nut seating on the flange for exerting tension on the lining to tighten the same on the shoe.

2. In a quick relining brake to be applied to the inside of a brake-drum, the combination of a shoe of arcuate form having substantially radial end faces, brake lining extending along the outer periphery of the shoe unattached to the shoe at intermediate points on its length, means for securing one end of the lining at one of said radial faces, said brake shoe having a lug at its other end extending in a substantially circumferential direction, and a member mounted in said lug detachably engaging the adjacent end of the brake lining and having means for exerting tension in the brake to secure the same on the shoe.

3. In a quick relining brake to be applied to the inside of a brake-drum, the combination of a shoe of arcuate form having substantially radial end faces, a brake lining extending along the ferential direction, a bolt mounted in said lug and having a threaded shank, and a nut on the threaded shank seating against the said lug, said last named bolt having a hook detachably engaging the adjacent end of the said lining and operating to develop tension in the lining to sel0 cure the same to the brake shoe.

THOMAS D. RADER. 

